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Q1: 1. All joints, connections, and splices shall be contained in a box a) Trueb) FalseSee Answer
Q2: 5. Explain Ohms law in detail and give an example to show how it is used calculate current in a series circuit.See Answer
Q3: 6. In the circuit below calculate the following: . Total resistance. The ammeter reading. The voltage dropped across R1. The reading on the ammeter if a second voltage source (battery) wasplaced in the circuit with a value of 27V (series aiding). The reading on the ammeter if a second voltage source (battery) wasplaced in the circuit with a value of 4V (series opposing).See Answer
Q4: 2. Differentiate between the piezoelectric effect and the converse piezoelectric effect.See Answer
Q5: Complete the design of the amplifier shown below given the DC and AC load lines on thegraph. (a) Determine the value of Ic and V (CE) when the transistor is biased, as shown by the graph of mac and mdc? Determine R(e1) and R(e2). (Hint: DC Circuit has both Emitter Resistors, and AC model has only R(e1) (c) Draw the small-signal model. Include the h-parameter values. (d) Determine the voltage gain of the amplifier. The BJT parameters are: BF= 150 and VA= 350 V (large). See Answer
Q6: 6. As the AWG number becomes smaller, the wire size becomes a) Larger b) SmallerSee Answer
Q7: 3. A # 8 copper wire THWN has an ampacity of 15 Amps. a) True b) FalseSee Answer
Q8: 2. NEC requires a grounding bushing wherever conduit enters a non-threaded opening on a box. a) True b) FalseSee Answer
Q9: Design an audio amplifier (the circuit of which is given below), using a single LM741A op-amp, with thefollowing characteristics: gain=20 dB, input resistor R1= 10K, -3dB point = 20 Hz (cutoff freqeuncy). Usethe non-inverting configuration, and roll off the gain at low frequencies with an input coupling capacitor sizedto meet the low-frequency gain specification and to reduce the effects of input offset voltage. Use properdesign to minimize the effects of input bias current on output offset. Assume that the signal source has zerooutput impedance Zout = 0. Determine the bandwidth of your audio amplifier design and calculate the roll-off(reduction) from the mid-frequency gain (in dB) at the highest audio frequency of 20 kHz. Determine thehighest input sinusoidal signal peak amplitude Vm, in the audio frequency range of 20 Hz to 20 kHz, that maybe amplified by your design without distortion. Use the attached specification sheets for the LM741 to obtainthe op-amp characteristics data you need for the design; select the worst-case values for the characteristicsneeded in your design. Show all the equation development in your report.See Answer
Q10:(4) P= 1²³R and V=IR Nominal Resistance = 301 and power Rating = 500W 500 = I²R = 1=500 30 = 4.08 A V= IR = 122.47 V Puncertainty in R÷ =) error accuraly = 0.5%, resolution = 1 V 30x0.5 = PEP. 1 => error = 0.5%, uncertainty in I = accuracy = 0,1%, resolution = 100mA Range => error will be according to 1A= error = 0.1 X 10 = 1% ... uncertainty in V = 1% +0,5% = 1.5%. ... Range = 122.47±1.5% = 122.47 ± 1.832 = 120.64 to 124.30 124 300See Answer
Q11:QUESTION 4 Given is temperature sensor with a sensing range 0°C...100°C and 2% accuracy full-scale. A temperature reading shows 54°C. Determine the maximum possible real temperature for this reading. Write your answer without the unit.See Answer
Q12:QUESTION 6 Given is a temperature sensor with a sensing range 0°C... 100°C. This sensor has been exposed to a temperature of 50°C for a long time and is then suddenly exposed to a temperature of 70°C. The output of the sensor is shown below. 70 50 Tin °Celsius 10 20 t in seconds Determine the 90% rise-time of the sensor in seconds, write your answer without the unit.See Answer
Q13:Determine vo as a function of the input voltages and the resistances.See Answer
Q14:Determine vo as a function of the input voltages and the resistances. V10 D₂ 0 R₁ + R₂ R₂ www R3 R3 RA ww R₁ +See Answer
Q15:1. (5) Upload a sketch of which pins are internally connected on the breadboard below, which is the same as provided with the Arduino kit. If needed, watch the following video on breadboarding (Breadboards). + 10. 11.. 12 13 14 15 → ១ ០៦ ១ ១ ខន ជន៩៦ 16 17 abcde 19 200 21 22. 23. 24. 25 26 27 28. 29. 0. abcde 30 . .. 12 • 13 . 15 .. .. . . 20 .... ..... 22 23 ... 24 fghij 29 30See Answer
Q16:Figure Q2.1 represents the true value of a noisy signal which is to be displayed on an oscilloscope, in order to estimate the amplitude and period of the underlying sawtooth waveform. a. Suggest appropriate vertical axis and timebase settings for the oscilloscope. b. How should the oscilloscope be triggered? Your answer should indicate where on the waveform you plan to trigger (and why!) and how the oscilloscope can be configured to achieve this. c. Two oscilloscopes are available, a 500 MHz 3 GSPS model and a 100 MHz 500 MSPS model. i. Explain what these specifications mean. ii. How will the displayed waveform differ between the two scopes? iii. Which scope is better suited to the measurement described?See Answer
Q17:Explain why the oscilloscope measurement configuration shown in Figure Q3.1 is (in most cases) incorrect. HINT: Multiple problems are present.See Answer
Q18:For each of the following measurements, state (with reasons) whether a DMM or oscilloscope is the more suitable test instrument. a. The DC voltage of a +12 V dc supply rail in a printed circuit board (PCB). b. The RMS voltage across a resistive heater driven by a 48 V ac 60 Hz square wave. c. The RMS current flowing in a resistor connected across the output of a function generator (5 V pp, 800 kHz). d. The RMS voltage across a loudspeaker with a 12 kHz sinusoidal input.See Answer
Q19:Task 4.1 - Calculate basic electrical parameters in D.C. circuits using electrical circuit theory A) What is the current when a charge of: a) 3.0C passes through a lamp in 20s? b) 3600C passes a point in 3.0 minutes? c) 0.2μC flows through a diode in 2.0ms? B) A charge of 4000μC passes each point in a wire in 50s. Calculate: a) The charge in coulombs b) The current in the wire c) The number of electrons per second passing each point in the wire (Electron charge = 1.6 x 10-1°C) C) a) What is the pd across a wire of resistance 8.00 when there is a current of 1.5A through it? b) What is the resistance of a wire if a p.d of 6.0V drives a current of 0.25A through it? c) A p.d of 3.0V is applied across a 150 resistor, what is the current? D) a) What is the power of a microwave oven that takes a current of 7.5A from a 230V supply? b) A small 48W electric heater is connected to a 12 V supply, calculate the current. c) When it is hot an electric bar fire has a resistance of 500. What is the power rating? E) A lamp has a p.d of 12V across it. Calculate how much electrical energy is transferred when a) A charge of 400C passes through it. b) A current of 2.5A passes through it for 30s. F) A vacuum cleaner has a rating of 460W on the 230V mains, what fuse should be fitted?See Answer
Q20:Task 4.2- Describe the principles of operation of electrical cells and review the applications in the modern world A) Write down 4 advantages and 4 disadvantages of secondary cells compared to primary cells. B) Write down three different types of fuel cell, for each one include a brief description of the process involved and where it is usedSee Answer

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